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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 8 Managing PNNI Nodes and PNNI Routing
Managing Priority Routing
Within the priority categories of 0 through15, connections are further divided into groups based on their
bandwidth. Connections requiring more bandwidth are routed before those requiring less bandwidth.
The number of bandwidth groups is fixed at 50, but you can specify the following ranges:
•
range with the lowest bandwidth requirement
•
range of cells per second in each range between the highest and lowest ranges.
Because the bandwidth groups are node-level, they apply to all priorities. The same ranges exist for
priority 0, priority 1, priority 2, and so on down to the lowest priority. Connections requiring the least
bandwidth are grouped at the low end of the range, and connections requiring the most bandwidth are
grouped at the top end of the range. The remaining connections are progressively grouped somewhere
between the upper and lower bounds.
Bandwidth for a priority is divided into three parts:
•
lowest range—You determine the lowest range by specifying the highest rate within the range. For
example, if you type 3000, the lowest range is 0–3000 cps.
•
highest range—Highest range is what is left over after you specify the lowest range, the number of
bandwidth groups, and the number of cells per second in each bandwidth increment.
•
All incremental ranges between the lowest and the highest.
Note
The derouting of SVCs uses the same priority routing criteria and the derouting of SPVCs.
Before you can prioritize a specific SPVC, you must set up the priority routing feature on the node itself,
as described in the section that follows.
Establishing Priority Routing on a Node
To display the current routing priority configuration, enter the dsppri-routing command:
PXM1E_SJ.7.PXM.a >
dsppri-routing
Priority Routing Configuration
--------------------------------
Number of bandwidth groups: 50
Size of first bandwidth group (in cps): 5000
Increment between bandwidth groups (in cps): 1000
Routing event buffer size (in 0.1-seconds): 0
Node startup routing delay (in 0.1-seconds): 0
To change the priority routing configuration, enter the cnfpri-routing command using the following
format:
mgx8830a.1.PXM.a >
cnfpri-routing
[-bwgrps <grps>] [-bwstart <start>] [-bwincr
<incr>][-pribuf <time>] [-nodebuf <delay>]
describes the options available in the cnfpri-routing command.
